Valve Cage Alignment for Serviceable Sealing Discs
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Solution Overview
Problem
Fluid control valve assemblies face challenges in accessing and aligning sealing discs due to assembly variability, tolerance stack-up, and limited accessibility, which complicates maintenance and increases inventory and service complexities.
Innovation Solution
The design includes a cage with integral aligning features and removable portions on the valve body, allowing access to trim components from multiple sides and reducing the number of components needed, thereby simplifying alignment and maintenance by integrating alignment features directly into the cage and allowing access via both sides of the valve body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional fluid control valve assemblies are designed with fixed valve bodies and multiple alignment components, then structural integrity and alignment precision are maintained, but accessibility for maintenance deteriorates and device complexity increases
Solution Approach 1:
The valve body is divided into a fixed portion and a removable portion that can be separated. The removable portion contains the sealing disc and can be accessed independently, allowing maintenance personnel to reach trim components from multiple sides without disassembling the entire valve assembly. This segmentation directly improves accessibility while reducing the need for additional alignment components.
Solution Approach 2:
The alignment features are integrated directly into the cage structure rather than being separate components. The cage includes integral alignment features that automatically align the sealing disc and trim components when the removable portion is attached, eliminating the need for multiple separate alignment components and simplifying the overall device complexity.
2Manufacturing precision
If multiple alignment components are used to ensure proper positioning of sealing discs, then alignment precision is improved, but tolerance stack-up increases and device complexity increases
Solution Approach 1:
Multiple alignment functions are merged into the cage structure through integral alignment features. Instead of using separate alignment pins, guides, and positioning components that would each contribute their own tolerances, the cage itself provides the alignment function, eliminating tolerance stack-up from multiple components and improving manufacturing precision.
Solution Approach 2:
The cage serves multiple functions simultaneously: it provides structural support, guides the valve stem, aligns the sealing disc, and maintains positioning of trim components. This multi-functionality reduces the number of separate alignment components needed, thereby reducing the cumulative tolerance stack-up while maintaining alignment precision.
3Productivity
If serviceable components are accessible only via a single end of the valve body, then structural simplicity is maintained, but maintenance time increases and ease of operation deteriorates
Solution Approach 1:
The valve body is segmented into fixed and removable portions, with the removable portion providing access to the sealing disc and trim components. This segmentation enables maintenance personnel to access serviceable components from multiple sides of the valve assembly, significantly reducing maintenance time and improving ease of operation without compromising structural integrity.
Data Source
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AI summary
Methods and apparatus to access and align sealing discs are disclosed herein. An example apparatus includes a cage of a fluid regulator, where the cage has a central aperture, and a valve stem to be received by the central aperture. The example apparatus also includes a diaphragm coupled to the valve stem, where an integral protrusion of the cage is to constrain a peripheral edge of the diaphragm against a removable portion of a valve body when the cage is coupled to the valve body. The apparatus further comprises a second removable portion at a second end of the valve body to allow access to the first sealing disc from the second end, the second end opposite the first end.